Miller was diagnosed with cancer late last year and after a period of treatment in the United States, he passed away on Friday.
Everyone at #CelticFC is deeply saddened to hear of the passing of former midfielder Liam Miller. Our thoughts and prayers are with his family and friends at this time.— Celtic Football Club (@CelticFC) 9 February 2018
RIP Liam, YNWA. pic.twitter.com/vMkT1CtJ2m
Im deeply saddened to hear of the passing of my friend and old team mate Liam Miler😢my thoughts and prayers are with his family and friends. RIP my friend🙏🏼— Stiliyan Petrov (@StanPetrov19) 9 February 2018
Sad hearing the awful news that Liam Miller has passed away this evening, taken far so soon by a terrible disease. Proud to have shared a dressing room with him over the years. #RIPLiamMiller— Kevin Kilbane (@kdkilbane77) 9 February 2018
Miller began his career with Celtic during the 1999-2000 campaign, making 44 appearances for the Scottish giants before earning a move to Manchester United.
The Irishman would make 22 outings for the Premier League side before later going on to represent Leeds United, Sunderland, Queens Park Rangers, Hibernian, Perth Glory, Brisbane Roar, Melbourne City, Cork City and Wilmington Hammerheads.
Miller also earned 21 caps for the Republic of Ireland between 2004 and 2009.